Improvement in eieyatoes



p @nimh tate Y sttmtt @Hire GEORGE R. CLARKE, or NEW YORK, N. Y.

Letters Patent lVo. 78,646, dated June E?, 1868.

IMPROVEMENT IN EIEVATORS.

TO ALL WHOM'IT MAY CON'ERN:

Be it known that I, GEORGE R. CLARKE, of New York city, county of New York, and State of New York,

have invented certain new and useful Improvements in Elevators; and I do hereby declare that the following lis a full, clear, and exact description of the same, reference being had to the accompanying drawing, and the letters of reference marked thereon, making partof this specification, in which* Figure l isp. vertical section.

Figure 2 is a side elevation.

Figure 3 is a plan of the anti-friction rollers.

Figure 4 is a plan and side view of the revolving table.

Figure 5 is a view of the cam and pulleys. i

Figure 6 is a. view of the anti-friction rollers, as supported by the segmental brackets c.

The nature of my invention consists ingaliixing over an ordinary hatchway a guide-frame, consisting of two parallelstandards, eonnect-edby an .upright beam, by means of which, when the same is taken in connection with a series of anti-friction rollers, having independent segment-.il bearings, whiclnare flush with the face of the frame, the table is elevated. f l i My invention alsov consists in applying under the platform'or table a revolving-table wheel, provided with unti-friction rollers above and below, the lower ones meshing and gearing With a screw-thread lever, whose operations are controlled by an operating-lever and clutch, the entire power being transmitted by means of a crank-` shaft, wheel, and endless belt.

To enable others skilled in the art to make and use my invention, I will now proceed to describe its con-` struction and operation.

A is an ordinary hatehway, fis a (table, by means of which goods and other articles are raised or elevnted. From this ordinaryhatehwny there rise two upright beams, a a, which are connected by a beam, a. On the sides of thesev standards a a are aliixed a series of parallel segmental metallic brackets or supports c. These brackets are constructed with an angular elbow-bearing-or metallic brace. n

In the upper end of these bearings are suitable openings, ZJ, corresponding with openings in the upriglrts a a, throughy which pass bearing-pins o, whereby the anti-friction rollers b are retained in position, and upon which they revolve.

Under this platformf there is,` a series of anti-friction rollers, y, which are connected by rods to the upper portion of the main shaft z' of the revolving table, or centre screw-thread wheel 2a. On the under surface of the wheel p there is arranged a seriesof anti-friction wheels, Z, so adjusted that they will work in or mesh with the threads of the screw-arm t.

v, o', and o are three anti-friction rollers, placed on the connecting-bar of the uprights, and over which passes/the endless belt t. This endless belt't passes over the pulleys s and s and the play-pulleys s, and passes down and under the main driving-wheel'zt, power' being communicated to the same by means of the crankshaft u. I I

In the rear of the screw-thread arm t there is a guide-bar, R. To this guide-b`ar R are attached two crankarms, S S,.which gear with two clutches, g and q', the whole being controlled by the lever r, and the whole mechanism being thrown in or out of gear, and the motion reversed, by means of this main lever r.

\ The operation is asfollows:

' Power is applied to thecrank-shaft u and the driving-pulley u, from which a belt passes upward, over and around the play-pulley s, and under and around theidriving-pulley s, communicating motion thereto in a certain direction; thence upward, and over the anti-friction pulleys o, o', and 11; thence down, under, and around the driving-pulley s', communicating motion in a contrary direction to the pulley s; thence over and around .the play-pulley s, down to the main driving-wheel, from whence it started.

By moving the levert' to the right, 'the screw-thread arm t clutches with the pulley s, and, its threads coming in contact with the Series of anti-friction rollers Z, the platform is raised.

By moving the lever oto the left? the screw-thread arm t clutehee with the pulley s', and the platform is lowered. K

By keeping the lever in the centre, the screw-thread arm t clutches with neither pulley, and the platform remains stationnryf i When the platform reaches its highest elevation, the stop-lever' H comes in contact with the stop-pin w', when the action of the entire mechanism is checked sind thrown out of gear, by means of the clutches q and q', and also, when it reaches ite lowest point of descent, the same operation is performed.

Having thus fully described my invention, what I claim therein as new, and desire to secure by Lettere Patent of the Unite States, is

l. The combination and arrangement of the hollow and revolving 'table and worin pa'allel guides, rollers, and their supporting-brackets, when the whole is operated by means of pulleys and endlesebelt, substantially as described. I

2. The endlessl belt t, when rthe same is used in combination with the table or platform p5 antifriction rollers b b, and screw-thread'arm t', when the wholeis so constructed es to operate substantially as described, and for the purpose specified. i

3. The combination of the lever 03' the guide-bnr R, and the clutches q anti g', the stop-lever H, and the stop-pin w', when the same are used and operated in the manner snbstantially as described.v

In testimony whereof, I have signed my name 'to this specification in the presence offtwosuhscribing witnesses;

- eno. n. CLARKE.

Witnesses:

JOHN D. BLoon, EDWIN JAMES. 

